ALB and polycystic ovary syndrome: PCOS did not show causal relationship with GST (Supplementary Materials: Table S1) /GPX (Table S2) /CAT (Table S3) /UA (Table S4) /zinc (Table S5) / alpha-tocopherol (Table S6) /ascorbic acid (Table S7) /retinol (Table S8) /albumin (Table S9) /TBIL (Table S10) according to five methods.